Green’s Dictionary of Slang

see cut one’s lucky under cut v.²

(US) an affectionate term of address, usu. to a fellow gambler.

1848

‘Ned Buntline’ Mysteries and Miseries of N.Y. I 35: Let’s hear what’s on the lay! Wot ’ave you got to say Bobby, my lucky. [Ibid.] I 39: Patter flash, my lucky, you’re as used to it as I am. [Ibid.] II 35: Vel, then, crack it, my lucky; but do it up right!